Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Exercisable Intrinsic Value

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Share Based Compensation Arrangement By Share Based Payment Award, Other Than Options, Exercises in Period, Total Intrinsic Value

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Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Outstanding Intrinsic Value.

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Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Weighted Average Remaining Contractual Term.

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Share Based Compensation Arrangement By Share Based Payment Award, Restriction on Transferability of awards

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Share-based Compensation, Percentage of Target Award Which Participant May Earn

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Share-based compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Issued

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Share-based compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Shares Withheld for Taxes

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Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Number, after shares used to satisfy grantee's tax withholding obligation for award under share-based payment arrangement, of restricted shares issued. Excludes cash used to satisfy grantee's tax withholding obligation.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Net number of non-option equity instruments granted to participants.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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Stock Incentive Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions				1 Months Ended	12 Months Ended
	Jan. 20, 2021	Dec. 31, 2020	Apr. 30, 2020	Feb. 28, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Common stock, shares issuable (in shares)		150,000,000			150,000,000	150,000,000
Compensation cost related to unearned performance awards		$ 17.1			$ 17.1
Total stock compensation expense					37.9	$ 41.7	$ 46.6
Excess tax benefit of stock awards					$ 2.5	$ 2.7	$ 1.6
Shares available for grant (in shares)		3,853,244			3,853,244
Shares earned (in shares)		(553,084)
Certain Retirees And Other Individuals
Shares earned (in shares)		(169,982)
Long Term Incentive Plan \| Minimum
Target award percentages					33.00%
Long Term Incentive Plan \| Maximum
Target award percentages					200.00%
Performance Shares
Shares awarded (in shares)					425,440
Recognition period		1 year 6 months
Weighted average grant-date fair value of performance awards granted (in dollars per share)					$ 70.84	$ 61.01	$ 71.40
Number of shares not vested (in shares)		582,952			582,952	932,182
Shares earned (in shares)					(553,084)
Restricted Stock Units (RSUs)
Shares awarded (in shares)					95,593
Compensation cost related to unearned performance awards		$ 5.1			$ 5.1
Recognition period		1 year 6 months
Weighted average grant-date fair value of performance awards granted (in dollars per share)					$ 70.83	$ 61.01	63.99
Number of shares not vested (in shares)		143,287			143,287	396,529
Shares earned (in shares)					(280,921)
Stock Appreciation Rights (SARs)
Vesting period					4 years
Compensation cost related to unearned performance awards		$ 1.7			$ 1.7
Recognition period		2 years 6 months
Weighted average grant-date fair value of performance awards granted (in dollars per share)					$ 12.31	$ 11.34	$ 12.88
SSAR Expiration Period					7 years
Total stock compensation expense					$ 1.9	$ 2.4	$ 2.4
Weighted average remaining contractual life of SSARs outstanding, in years					4 years
Total fair value of SSARs vested					$ 3.1
Number of shares not vested (in shares)		233,025			233,025
Total intrinsic value of outstanding SSARs		$ 14.8			$ 14.8
Total intrinsic value of exercisable of SSARs		$ 6.7			6.7
Total intrinsic value of SSARs exercised					$ 10.2
SSARs granted (in shares)					187,100
Restricted Stock
Total stock compensation expense					$ 1.4
Weighted-average period for compensation cost expected to be recognized, in years					1 year
Restricted common stocks issued (in shares)			25,542
Restricted common stocks issued after shares withheld for taxes (in shares)			19,862
Long Term Incentive Plan
Performance period					3 years
2006 Plan
Common stock, shares issuable (in shares)		10,000,000			10,000,000
Subsequent Event [Member]
Share-based compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Issued				233,668
Share-based compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Shares Withheld for Taxes				149,434
Subsequent Event [Member] \| Performance Shares
Shares awarded (in shares)	134,754
Subsequent Event [Member] \| Restricted Stock Units (RSUs)
Shares awarded (in shares)	89,775